The only way out of
the yard that I now was in was
to descend
a few
stairs that led up into the centre (A) of an undergroundmaze,
through
the winding of which I must pass before I could take my leave by the
door
(B).
But I knew full well that in the great darkness of this dreadful
place I might well wander for hours and yet return to the place from
which I set out.
How was I then to reach the door with
certainty?

With
a
plan of the maze it is but a simple matter to trace out the route, but
how was the way to be found in the place itself in utter darkness?